Table 7. Risk factors for necrosis and re-operation. *Matsen et al.,[ 5] mild: no intervention needed, healing complete at eight weeks, moderate: office debridement, healing complete at eight weeks, severe: operating room debridement, implant loss, or healing not complete at 8 weeks. Results in bold are statistically significant.

Risk factor	Degree of necrosis*		Re-operation
	Spearman’s rho	P-value	Odds’s ratio	95% CI
Age	0.241	0.092
BMI	0.268	0.060
Cup size	-0.056	0.697
Previous or current smoking	-0.004	0.976
Hypertension (n = 4)	0.043	0.766
Diabetes (n = 3)	-0.046	0.751
Prior breast augmentation (n = 5)	-0.175	0.225
Previous breast reduction (n = 3)	0.286	0.044
Previous radiation therapy (n = 11)	0.302	0.033	7.2	1.4−37.3
Previous chemotherapy (n = 14)	0.153	0.288
Infection (n = 12)	0.443	0.001	15.4	2.6−89.7
Nipple-sparing mastectomy (n = 22)	0.011	0.939
Hammond (n = 17)	-0.013	0.927
Weight of mastectomy specimen	0.173	0.229
Use of an acellular dermal matrix (n = 3)	0.029	0.843
Number of days of delay to HBOT	-0.166	0.250
Total number of sessions of HBOT	0.130	0.367